At least two of the three infants whose bodies were found in the filthy, vermin-infested house in Blackstone, Massachusetts in August appear to have been alive for some time, Worcester county prosecutors said Tuesday.

Erika Murray, 31, of Blackstone, who did not appear for a hearing Tuesday in Uxbridge District Court , is facing charges of fetal death concealment, permitting substantial injury to a child and witness intimidation.

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Worcester County Asst. District Attorney John Bradley said that two of the infants were dressed in onesies and were wearing diapers when their decomposed remains were found.

One of the three dead babies had a full head of hair and was stuffed inside a backpack, Bradley said. He said that infant and the remains of two others were discovered in the bedroom closets of Murray’s two older children, 10 and 13.

The state Department of Children and Families removed four children ranging in age from 6 months to 13 years from Murray's home in August after her 10-year-old son went to a neighbor's house and asked for help in quieting a crying baby.

The neighbor found a 6-month-old baby covered in feces and a 3-year-old child. After interviewing the older children, police got a search warrant and went back to the house, where they found the remains of three babies.

The state medical examiner is trying to determine whether they were newborns or fetuses.

Murray's boyfriend, Ramon Rivera, was in the same courthouse Tuesday for a separate hearing on marijuana charges.

Murray's attorney, Keith Halpern, has said he believes Murray is suffering from a mental illness. Bail was set at $1 million Tuesday.

No birth records could be found for the two youngest children. Halpern said previously that he believes Murray secretly gave birth to those children because her boyfriend didn't want any more kids than the two they already had together, the 10-year-old boy and a 13-year-old girl.

Rivera has not been charged in connection with the discovery of the infants' remains.

The Blackstone Board of Health condemned the house where Murray, Rivera and the children lived and are planning to demolish it later this month.

Authorities said it contained piles of dirty diapers, trash and the remains of dead animals.